Issue 54, 2017, Issue in Progress

Simple synthesis of SiGe@C porous microparticles as high-rate anode materials for lithium-ion batteries

Abstract

We report the synthesis of SiGe@C porous microparticles (PoSiGe@C) via the decomposition of Mg2Si/Mg2Ge composites, acid pickling and subsequent carbon coating processes, respectively. The content of Ge can be tuned by the initial ratio of Mg2Si and Mg2Ge in the composite. The as-synthesized PoSiGe@C has been used as the anode material of lithium-ion batteries, which shows an enhanced cyclic and rate performance compared to bare Si, PoSiGe as well as PoSi@C porous microparticles. Briefly, the PoSiGe@C delivers a good cycling stability with 70% capacity retention after 400 cycles and only 0.075% capacity loss per cycle at the current density of 0.8 A g−1. Furthermore, super rate capability is also expressed by the PoSiGe@C. The unique porous structure, and synergistic effect of Si and Ge, may lead to the inherent high lithium-ion diffusivity and electrical conductivity of Ge, and good volume alleviation, which results in the good electrochemical performance.

Graphical abstract: Simple synthesis of SiGe@C porous microparticles as high-rate anode materials for lithium-ion batteries

Article information

Article type
Paper
Submitted
18 Apr 2017
Accepted
29 Jun 2017
First published
05 Jul 2017
This article is Open Access
Creative Commons BY license

RSC Adv., 2017,7, 33837-33842

Simple synthesis of SiGe@C porous microparticles as high-rate anode materials for lithium-ion batteries

Y. Zhang, N. Du, C. Xiao, S. Wu, Y. Chen, Y. Lin, J. Jiang, Y. He and D. Yang, RSC Adv., 2017, 7, 33837 DOI: 10.1039/C7RA04364C

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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